Indoor or outdoor cat?
If indoor, treat the house.
If outdoor, be vigilant with the Advantage. If you use the good stuff, and stick to a monthly schedule, it works well. But you have to commit to it; it's better at prevention than it is at treatment.
If you have a cat, though, I strongly advise keeping it indoors. Litter boxes aren't a big deal if you keep them clean, and scratching the furniture is typically not a huge deal as long as the cat is well cared for and has other toys/scratching posts to deal with all the extra energy. An indoor cat takes a tiny bit more work (compared to putting a food bowl down and opening the door occasionally), but they have much longer lifespans on average and are FAR less likely to have problems with fleas, worms, or common cat illnesses.
Lastly, if you're one of the bajillion people who got a cat based on the assumption they are self sufficient and can therefore be ignored, do everyone a favor and find it a new home. They don't demand any more attention than do dogs, but for some reason people tend to resent the fact they don't require less.

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